National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Monticello, Sullivan County International Airport (KMSV)

Lat: 41.7°NLon: 74.8°WElev: 1404ft.

Fair

48°F

9°C

Humidity 89%
Wind Speed SW 3 mph
Barometer 29.89 in (1012.2 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 16 Jun 1:56 am EDT
Extended Forecast for

Mongaup Valley NY

  • Overnight

    Overnight: Clear, with a low around 44. Calm wind.

    Low: 44 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 74. Calm wind becoming west around 5 mph in the afternoon.

    High: 74 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 4am. Otherwise, partly cloudy, with a low around 50. Calm wind.

    Low: 50 °F

    Mostly Clear
    then Patchy
    Fog

  • Wednesday

    Wednesday: Showers likely, with thunderstorms also possible after 2pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 75. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 75 °F

    Chance
    Showers and
    Patchy Fog
    then Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 7pm, then a chance of showers and thunderstorms between 7pm and 8pm, then a chance of showers after 8pm. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 54. Calm wind. Chance of precipitation is 60%.

    Low: 54 °F

    Showers
    Likely and
    Patchy Fog

  • Thursday

    Thursday: Showers before 11am, then showers and possibly a thunderstorm between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Areas of fog before 8am. High near 80. Chance of precipitation is 100%.

    High: 80 °F

    Showers and
    Areas Fog

  • Thursday Night

    Thursday Night: A chance of showers before 8pm. Partly cloudy, with a low around 56. Chance of precipitation is 30%.

    Low: 56 °F

    Chance
    Showers then
    Partly Cloudy

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 44. Calm wind.
Tuesday
Sunny, with a high near 74. Calm wind becoming west around 5 mph in the afternoon.
Tuesday Night
Patchy fog after 4am. Otherwise, partly cloudy, with a low around 50. Calm wind.
Wednesday
Showers likely, with thunderstorms also possible after 2pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 75. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers likely and possibly a thunderstorm before 7pm, then a chance of showers and thunderstorms between 7pm and 8pm, then a chance of showers after 8pm. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 54. Calm wind. Chance of precipitation is 60%.
Thursday
Showers before 11am, then showers and possibly a thunderstorm between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Areas of fog before 8am. High near 80. Chance of precipitation is 100%.
Thursday Night
A chance of showers before 8pm. Partly cloudy, with a low around 56. Chance of precipitation is 30%.
Juneteenth
Mostly sunny, with a high near 76.
Friday Night
Mostly clear, with a low around 51.
Saturday
Sunny, with a high near 74.
Saturday Night
Mostly clear, with a low around 51.
Sunday
Sunny, with a high near 75.
Sunday Night
Partly cloudy, with a low around 52.
Monday
A chance of showers. Partly sunny, with a high near 74. Chance of precipitation is 50%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mongaup Valley NY
 41.67°N 74.79°W (Elev. 1175 ft)
Last Update:
2:07 am EDT Jun 16, 2026
Forecast Valid:
2am EDT Jun 16, 2026-6pm EDT Jun 22, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation